From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Johan Hovold , Mauro Carvalho Chehab , linux-edac , Borislav Petkov , Sasha Levin Subject: [PATCH AUTOSEL 4.14 77/87] EDAC, i7core: Fix memleaks and use-after-free on probe and remove Date: Mon, 17 Sep 2018 03:03:13 +0000 Message-ID: <20180917030220.245686-77-alexander.levin@microsoft.com> References: <20180917030220.245686-1-alexander.levin@microsoft.com> In-Reply-To: <20180917030220.245686-1-alexander.levin@microsoft.com> Content-Language: en-US Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: From: Johan Hovold [ Upstream commit 6c974d4dfafe5e9ee754f2a6fba0eb1864f1649e ] Make sure to free and deregister the addrmatch and chancounts devices allocated during probe in all error paths. Also fix use-after-free in a probe error path and in the remove success path where the devices were being put before before deregistration. Signed-off-by: Johan Hovold Cc: Mauro Carvalho Chehab Cc: linux-edac Fixes: 356f0a30860d ("i7core_edac: change the mem allocation scheme to make= Documentation/kobject.txt happy") Link: http://lkml.kernel.org/r/20180612124335.6420-2-johan@kernel.org Signed-off-by: Borislav Petkov Signed-off-by: Sasha Levin --- drivers/edac/i7core_edac.c | 22 +++++++++++++++------- 1 file changed, 15 insertions(+), 7 deletions(-) diff --git a/drivers/edac/i7core_edac.c b/drivers/edac/i7core_edac.c index c16c3b931b3d..6c7d5f20eacb 100644 --- a/drivers/edac/i7core_edac.c +++ b/drivers/edac/i7core_edac.c @@ -1177,15 +1177,14 @@ static int i7core_create_sysfs_devices(struct mem_c= tl_info *mci) =20 rc =3D device_add(pvt->addrmatch_dev); if (rc < 0) - return rc; + goto err_put_addrmatch; =20 if (!pvt->is_registered) { pvt->chancounts_dev =3D kzalloc(sizeof(*pvt->chancounts_dev), GFP_KERNEL); if (!pvt->chancounts_dev) { - put_device(pvt->addrmatch_dev); - device_del(pvt->addrmatch_dev); - return -ENOMEM; + rc =3D -ENOMEM; + goto err_del_addrmatch; } =20 pvt->chancounts_dev->type =3D &all_channel_counts_type; @@ -1199,9 +1198,18 @@ static int i7core_create_sysfs_devices(struct mem_ct= l_info *mci) =20 rc =3D device_add(pvt->chancounts_dev); if (rc < 0) - return rc; + goto err_put_chancounts; } return 0; + +err_put_chancounts: + put_device(pvt->chancounts_dev); +err_del_addrmatch: + device_del(pvt->addrmatch_dev); +err_put_addrmatch: + put_device(pvt->addrmatch_dev); + + return rc; } =20 static void i7core_delete_sysfs_devices(struct mem_ctl_info *mci) @@ -1211,11 +1219,11 @@ static void i7core_delete_sysfs_devices(struct mem_= ctl_info *mci) edac_dbg(1, "\n"); =20 if (!pvt->is_registered) { - put_device(pvt->chancounts_dev); device_del(pvt->chancounts_dev); + put_device(pvt->chancounts_dev); } - put_device(pvt->addrmatch_dev); device_del(pvt->addrmatch_dev); + put_device(pvt->addrmatch_dev); } =20 /*************************************************************************= *** --=20 2.17.1